2018年 第4卷 第5期
《工程（英文）》 >> 2018年 第4卷 第5期 doi: 10.1016/j.eng.2018.08.001
氧化还原氧化裂解石脑油制乙烯的过程模拟与分析
a Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695-7905, USA
b School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
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摘要
石脑油热裂解制乙烯（C2H4）是一种能源密集型工艺（每吨C2H4 高达40 GJ 热量），会形成大量焦炭和氮氧化物（NOx），而且每产生1 kg C2H4 就有1.8~2 kg 的二氧化碳（CO2）排放量。我们提出了石脑油氧化还原氧化裂解（redox oxy-cracking，ROC）的替代方法。在该两步法中，石脑油裂解产生的氢气（H2）首先在氧化还原催化剂的作用下与其晶格氧选择性地燃烧。随后氧化还原催化剂被空气再次氧化并释放热量，以满足裂解反应对热量的需求。这个强化过程减少了附加能量的消耗以及CO2 和NOx 的排放。此外，由于H2 的选择性燃烧，C2H4 和丙烯（C3H6）的形成可以被增强。在本研究中，我们基于最近开发氧化还原催化剂的实验数据，使用ASPEN Plus® 模拟ROC工艺。与传统的石脑油裂解相比，ROC 工艺可将能耗和CO2 排放量降低52%。该工艺的上游部分少消耗约67% 的能量，同时每千克石脑油原料多产生28% 的C2H4 和C3H6。
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